Also found in: Dictionary, Thesaurus, Medical, Wikipedia.


A water-soluble mixture of proteoses and amino acids derived from albumin, meat, or milk; used as a nutrient and to prepare nutrient media for bacteriology.



a product formed by the partial hydrolysis of proteins and consisting chiefly of a mixture of various polypeptides and also containing dipeptides, tripeptides, and free amino acids. Peptones are formed by the action of proteolytic enzymes in gastric and pancreatic juices (pepsin, trypsin) on proteins or by careful hydrolysis of proteins in acid or alkaline solutions. The composition and name of a peptone depend on the type of protein from which the peptone is derived. Thus, there are meat peptones, fish peptones egg peptones, and others. Peptones are used in microbiology for the preparation of nutrient media.

References in periodicals archive ?
source subtilis subtilis peptone 152 270 NaNO3 38 24 yeast extracts 220 210 corn extracts 570 550 Note: Table made from bar graph.
Statistical analysis revealed that the levels of glucose (A), peptone (B), and yeast extract (D) had a significant effect on the antifungal activity of B.
Oxoid Alkaline Peptone Water complies with the formulation recommended for the isolation of Vibrio species in several recognized international food and water standards, including FDA/BAM, APHA, ISO 8914:1990 and the UK Environment Agency's Water Testing Methods.
equiseti was cultivated on Czapek's peptone liquid medium containing (g/l) glucose (30), yeast (2), peptone (10), NaNO3 (3), KH2PO4 (0.
glycines causing bacterial pustule of soybean Tests Reaction Starch hydrolysis + Gelatin liquefaction + KOH solubility + H2S production + Acid production Sucrose + (carbon sources) Dextrose + Glucose + Acid production (nitrogen sources) Peptone - Note + : Positive - : Negative Table 3.
For enzyme production self-designed fermentation medium comprising of (%) peptone 1.
Yease extract, peptone, dextrose (YPD) medium (10 g/L yeast extract, 10g/L peptone, and 20 g/L glucose) supplemented with Zeocin (100 [micro]g/mL) was used for the selection of the transformant P pastoris X33.
1% peptone, and dried for 24 hours at 23 C and 33% relative humidity.
CM1: Dextrose 10, Peptone 5, Epsom salt 5, KH2 PO4 5, Common salt 2.
Optimization of the selected bacteria for auxin production: Optimization of auxin production was done by providing different physical conditions (temperature, pH, time and osmotic pressure) and chemical factors (glucose, sucrose, peptone and tryptophan).